Telephone bell or ringer.



P. G. BURNS.

TELEPHONE BELL 0R RINGER.

APPLIGATION FILED DEC. 24, 1906.

Patented Apr. 5, 1910.

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PETER G. BURNS, OF

CHICAGO, ILLINOIS.

TELEPHONE BELL OR BINGER.

, Specification of Letters Patent Patented Apr. 5, 19 10.

Application filed December 24, 1906. Serial No. 349,308.

To all whom it may concern:

Be it known that I, PETER C. BURNS a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Telephone Bells orRingers, of which the following is a specification.

Mly invention relates to improvements in telephone ringers, and has forits salient object to provide an improved construction, which is simple,cheap and efficient, for positioning the armature in such relation tothe electromagnet cores that it is normally balanced therebetween, andis free to assume, under the influence of the electromagnet, itsoperating'position in such plane as will make it most responsive to theattracting and repelling influence of'the electromagnet.

Other and further objects of my invention will become apparent to thoseskilled in the art from the following description, taken in conjunctionwith the accompanying drawing, wherein;

Figure 1 is an elevation with parts broken away, of a telephone bellringer movement embodying my invention; and, Fig. 2 is a central sectionon line 22 of Fig. 1.

Throughout the figures like numerals of reference refer always to likeparts.

In the drawing 5 indicates a usual magnetic yoke, having its ends bentas at 6 to form feet.

7 7 indicate permanent magnets of wide U-shape.

8. and 8 indicate electromagnet cores, surrounded by coils 9, 9respectively.

10 indicates a screw securing core 8 and permanent magnet 7 to the yoke5, in the customary manner, such that the free end of the magnet 7overlies the free end of the electromagnet core 8 at a suitable distancetherefrom.

11, 11 indicate side posts secured to the feet 6 of the yoke, extendingin parallelism to the electromagnet, in the customary manner, and havingtheir free extremities threaded as at 12.

14 indicates a bridge member, preferably of diamagnetic material, at itsopposite ends perforated and engaging the threaded stem 12, andadjustably secured thereon by upper and lower nuts 15 and 16,constituting a pair. The central portion 14: of the bridge 14 isdeflected into a plane parallel to the I body of the bridge, but closerto the poles 1 of cores 8, 8 than the body of said bridge. To suchdeflected portion of the bridge is secured a spring 17 preferably lyingin a plane substantially parallel to the bridge 14, and from points onsaid spring respectively opposite to the central point of attachment, anarmature 18 receives its support. In the construction which I hereinillustrate the armature 18 is directly secured at its end to the ends ofthe spring 17, the extremities of the armature being deflected out ofthe general plane of the armature as indicated at 18 on the drawing, sothat the armature lies in a plane generally parallel to that of thespring but slightly removed therefrom. Thus it will be seen that thepermanent magnets and electromagnets being constructed and related inaccordance with the usual teachings of polarized bell constructions, thearmature is free to respond to the attracting and repelling influencesof the magnets, so that the armature and the free ends of the springWill be tilted first in one direction and then in the other. To asuitable portion of these moving parts, preferably to the center of thearmature, I secure the striker rod 19, equipped with its usual striker20 adapted for coaction with suitable sounding devices illustrated indotted lines as a customary bell. I find that a bell movementconstructed in this manner is very sensitive, the armature being free toadjust itself bodily under the influence of the magnetic forces actingthereon, to planes of position wherein it may most readily respond tosuch influences.

While I have herein described in some detail a specific embodiment of myinvention, involving a spring and armature extending in the same lineardirection, with the spring bending under strain in a directiontransverse to its longitudinal directions, it will be understood that Ido not intend to limit myself to this specific construction further thanas specified in the claims, as departures may readily be made from themechanical construction of the apparatus without departure from thespirit and scope of my invention.

Having thus described my invention, what I claim and desire to secure byLetters Pat- 'ent, of the United States, is:

ing movements of the armature, a spring supporting said armature forrocking movement, having said armature secured thereto at separatedpoints, and a support for said spring between said separated points.

2. In an electric bell or ringer, electromagnetic means, anormally-polarized, rock ing armature, a spring to which the oppositeends of the armature are attached, a support for said springintermediate the points of attachment of the armature, and a strikersuitably associated with the armature.

3. In an electric bell or ringer, permanent magnets, and anelect-romagnet, suit-ably associated, a bridge, a substantially straightspring centrally secured to said bridge, a rocking armature suitablyassociated with the magnets and normally polarized, secured at oppositeends to said spring and arranged when rocked in response to energizationof the electromagnet to put such spring under tension, and a strikeroperatively associated with the armature.

4:. In an electric bell or ringer, electromagnetic means having twopoles, and an armature arranged with its ends overlying said poles, saidarmature being free and unsupported adjacent its center, a strikerconnected with the armature, a spring extending throughout in a lineardirection substantially parallel to the armature, centrally supported,and at its ends secured to the ends of the armature, and means forafiording central support to said spring.

5. In a telephone bell or ringer, electromagnetic means having twopoles, a normally-polarized, rocking armature having its ends overlyingsaid poles, a substantially straight spring centrally supported and atits ends normally engaging said armature and maintaining its ends inposition sub stantially equidistant from the electro-mag net poles,means for affording such central support to the spring, and a strikeroperatively associated with the armature.

6. In an electric bell or ringer, electromagnetic means, an armaturehaving its extremities deflected out of the general plane thereof, aspring secured to and connecting the deflected extremities of thearmature and leaving the mid-portion of the armature free of allsupport, and a central support for said spring.

In testimony whereof I hereunto set my hand in the presence of twowitnesses.

PETER G. BURNS.

In the presence of- Fomn BAIN, MARY F. ALLEN.

